What is the difference between "Indexer" and "Index All" server tasks in Domino Server?

Can someone tell me the difference between one and the other:

Task Activity

Index All Updating d_dir/database.nsf view ‘A01-Export’

Indexer Updating d_dir/database.nsf view ‘(Admin-All)’

I’m guessing one is “update” and the other is “updall”, but which is which?